If you download the Looker BigQuery Chrome extension, you will see the Looker icon when viewing lists of tables in BigQuery. The extension enables you to create an ad hoc Looker Explore directly from your BigQuery console.
Configuring the extension
The first thing you will need to do is configure the extension.
Click on the Looker icon in your menu bar, then click "Options" on the drop down.
That will open the configuration page. You will need to fill in your Looker Base URL and the name of the BigQuery connection you are using.
Once that is done, the Chrome extension will be able to explore tables from BigQuery in your Looker instance.
Using the Looker BigQuery Chrome Extension
While viewing a table's listing in the BigQuery UI, either click the Looker icon or open the table's menu and choose Explore in Looker.
Looker displays an on-the-fly explore for that table, letting you use Looker on a BigQuery table before you've modeled it. Looker generates a temporary model with a view for the table, then displays the explore, providing:
You can then explore the table's data, just like in a LookML view.
Note that when using this extension, there is no LookML file associated with the explore — it is just an on-the-fly view of the table.